Not Good At Grinding.

I have a bonus that I need to complete in one week at empire poker. It involves playing 5300 raked hands. I can logically deduce then, that I need at least 5 hours of poker a day.

the problem is, that unless Im playing an MTT, I cant sit at the computer for longer than an hour, I feel my concentration starting to slip. Is this normal?

Up to now, after that hour, I usually leave the tables, hit up the forum, and relax. But the problem is, it takes me forever to get back into my rythm.

How can I make myself get over this? It's really hurting my ability to get this bonus.